1062 Duplicate entry '261228-7443 'for key' PRIMARY '

[crb_style]

MySQL is telling you that you're trying to insert a Primary Key that already exists in the table. Primary Keys must be unique [1] and there can never be a duplicate.

What data are you trying to insert into what table and why?

[1] Unique key

I know that a primary key can not be duplicated, but when you import large files to an external customer with automatic procedures at night it can happen that the file that you're importing is therefore wrong to have such lines dupicate. This is a mistake, however, to ensure that the import procedure is solid should not interrupt the process but only report the error otherwise the shop the next morning will no catagories and or products for example.